/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.hadoop.hbase.util; import java.util.ArrayList; import java.util.Collections; import java.util.List; /** * Utility methods for Iterable including null-safe handlers. */ public class IterableUtils { private static final List<Object> EMPTY_LIST = Collections .unmodifiableList(new ArrayList<Object>(0)); @SuppressWarnings("unchecked") public static <T> Iterable<T> nullSafe(Iterable<T> in) { if (in == null) { return (List<T>) EMPTY_LIST; } return in; } }